@AndrewLeach I know you all just marked this as a duplicate, but I am not satisfied by the duplicate answer. We use "make" in this instance because "Two and two" forms a compound subject joined by "and". Compound subjects joined by "and" are always plural; therefore, we use the plural verb "make".
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Apple FreejeansApr 26 '14 at 15:41

@AP Have you looked at the duplicate's answers? They say the same thing as you; and offer the contrary view too. So it is a duplicate.
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Andrew Leach♦Apr 26 '14 at 16:44